I really quickly hacked together a script (https://github.com/DanGe42/xkcd-1446-fetcher) to fetch every frame starting from the current one so I wouldn't have to keep the page open all night. There's not much more to it than a few modifications I made to Randall's client-side script to make it compatible with Node.js and write to the file system instead. Hopefully it doesn't crash overnight on my server.